The meaning of LOCK is a fastening (as for a door) operated by a key or a combination. How to use lock in a sentence.

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No lock is 100 percent foolproof, but the door lock you choose depends on what you want to secure. A latchbolt or deadbolt is a good choice for a door that already has a locking door …

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LOCK definition: a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …

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